Margarita snails are said to be sub-tropical and eventually cook in normal reef tank temperatures so I would skip those. My personal favorites are mini brittle stars, Abalone, Turbo snails and Stomatella snails. LFS wont sell mini brittle stars or Stomatella but if you're lucky you will get them on your liverock.
I'd run the skimmer constantly as well. Its actually more important for it to run at night than during the day (if you had to pick one). Algae stops performing photosynthesis in the dark which causes your pH to drop because CO2 builds up. A skimmer helps keep the water well oxygenated and buffers this effect.
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